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 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
 * conditions and the following disclaimer in the documentation and/or other materials provided
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 * 3. Neither the name of the copyright holder nor the names of its contributors may be used to
 * endorse or promote products derived from this software without specific prior written
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
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package com.oracle.truffle.llvm.nodes.intrinsics.interop;

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.TruffleLanguage.ContextReference;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.NodeChild;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.interop.ForeignAccess;
import com.oracle.truffle.api.interop.InteropException;
import com.oracle.truffle.api.interop.KeyInfo;
import com.oracle.truffle.api.interop.Message;
import com.oracle.truffle.api.interop.TruffleObject;
import com.oracle.truffle.api.interop.UnknownIdentifierException;
import com.oracle.truffle.api.interop.UnsupportedMessageException;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.llvm.nodes.intrinsics.llvm.LLVMIntrinsic;
import com.oracle.truffle.llvm.runtime.LLVMContext;
import com.oracle.truffle.llvm.runtime.interop.convert.ForeignToLLVM;
import com.oracle.truffle.llvm.runtime.interop.convert.ForeignToLLVM.ForeignToLLVMType;
import com.oracle.truffle.llvm.runtime.nodes.api.LLVMExpressionNode;
import com.oracle.truffle.llvm.runtime.pointer.LLVMNativePointer;

@NodeChild(value = "name", type = LLVMExpressionNode.class)
public abstract class LLVMPolyglotImport extends LLVMIntrinsic {

    @Child LLVMReadStringNode readString = LLVMReadStringNodeGen.create();
    @Child Node read = Message.READ.createNode();
    @Child ForeignToLLVM toLLVM;

    @Specialization(rewriteOn = UnknownIdentifierException.class)
    protected Object doImportExisting(Object name,
                    @Cached("getContextReference()") ContextReference<LLVMContext> ctxRef) throws UnknownIdentifierException {
        String symbolName = readString.executeWithTarget(name);

        LLVMContext ctx = ctxRef.get();
        try {
            Object ret = ForeignAccess.sendRead(read, (TruffleObject) ctx.getEnv().getPolyglotBindings(), symbolName);
            return getToLLVM().executeWithTarget(ret);
        } catch (UnsupportedMessageException ex) {
            throw ex.raise();
        }
    }

    @Specialization
    protected Object doImport(Object name,
                    @Cached("createKeyInfo()") Node keyInfo,
                    @Cached("getContextReference()") ContextReference<LLVMContext> ctxRef) {
        String symbolName = readString.executeWithTarget(name);

        TruffleObject bindings = (TruffleObject) ctxRef.get().getEnv().getPolyglotBindings();
        int info = ForeignAccess.sendKeyInfo(keyInfo, bindings, symbolName);
        if (KeyInfo.isReadable(info)) {
            try {
                Object ret = ForeignAccess.sendRead(read, bindings, symbolName);
                return getToLLVM().executeWithTarget(ret);
            } catch (InteropException ex) {
                throw ex.raise();
            }
        } else {
            return LLVMNativePointer.createNull();
        }
    }

    private ForeignToLLVM getToLLVM() {
        if (toLLVM == null) {
            CompilerDirectives.transferToInterpreterAndInvalidate();
            toLLVM = insert(getNodeFactory().createForeignToLLVM(ForeignToLLVMType.POINTER));
        }
        return toLLVM;
    }

    protected Node createKeyInfo() {
        return Message.KEY_INFO.createNode();
    }
}
